U.S. patent application number 15/535207 was filed with the patent office on 2017-12-28 for uplink transmission power control method and apparatus.
This patent application is currently assigned to LG ELECTRONICS INC.. The applicant listed for this patent is LG ELECTRONICS INC.. Invention is credited to Joonkui AHN, Suckchel YANG.
Application Number | 20170374624 15/535207 |
Document ID | / |
Family ID | 56126908 |
Filed Date | 2017-12-28 |
United States Patent
Application |
20170374624 |
Kind Code |
A1 |
AHN; Joonkui ; et
al. |
December 28, 2017 |
UPLINK TRANSMISSION POWER CONTROL METHOD AND APPARATUS
Abstract
A method and an apparatus for controlling uplink transmission
power in a wireless communication system are provided. The
apparatus receives transmit power command (TPC) monitoring
information for receiving a plurality of TPCs for adjusting uplink
transmission power for a plurality of serving cells. The apparatus
obtains the plurality of TPCs by monitoring a downlink control
channel on the basis of the TPC monitoring information.
Inventors: |
AHN; Joonkui; (Seoul,
KR) ; YANG; Suckchel; (Seoul, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LG ELECTRONICS INC. |
Seoul |
|
KR |
|
|
Assignee: |
LG ELECTRONICS INC.
Seoul
KR
|
Family ID: |
56126908 |
Appl. No.: |
15/535207 |
Filed: |
December 14, 2015 |
PCT Filed: |
December 14, 2015 |
PCT NO: |
PCT/KR2015/013685 |
371 Date: |
June 12, 2017 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
62091631 |
Dec 15, 2014 |
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 52/34 20130101;
H04W 52/146 20130101; H04W 52/58 20130101; H04W 72/0413 20130101;
H04W 52/54 20130101; H04W 72/1289 20130101 |
International
Class: |
H04W 52/14 20090101
H04W052/14; H04W 52/54 20090101 H04W052/54 |
Claims
1. A method for controlling uplink transmission power in a wireless
communication system, the method comprising: receiving, by a
wireless device, transmit power command (TPC) monitoring
information for receiving a plurality of TPCs to adjust an uplink
transmission power for a plurality of serving cell; receiving, by
the wireless device, a TPC payload by monitoring a downlink control
channel based on the TPC monitoring information; acquiring a
plurality of TPCs within the TPC payload; and applying the
plurality of TPCs to the uplink transmission power for each of the
plurality of serving cells.
2. The method of claim 1, wherein the TPC monitoring information
comprises a TPC identifier masked with a cyclic redundancy check
(CRC) of the downlink control channel and information on a
plurality of TPC indexes indicating the plurality of TPCs within
the TPC payload.
3. The method of claim 2, wherein the TPC monitoring information
comprises information on a size of the TPC payload.
4. The method of claim 1, wherein the downlink control channel is
monitored in one cell of the plurality of serving cells.
5. The method of claim 4, wherein the downlink control channel is
monitored in a common search space of one cell of the plurality of
serving cells.
6. The method of claim 5, wherein one cell of the plurality of
serving cells is a primary cell.
7. The method of claim 1, wherein the uplink transmission power for
each of the plurality of serving cells is an uplink transmission
power for a physical uplink control channel (PUCCH) of a
corresponding serving cell.
8. The method of claim 7, wherein the plurality of TPCs comprises a
first TPC and a second TPC, the first TPC is applied to uplink
transmission power for a PUCCH of a first serving cell, and the
second TPC is applied to uplink transmission power for a PUCCH of a
second serving cell.
9. The method of claim 8, wherein the first TPC and the second TPC
have the same number of bits.
10. The method of claim 1, wherein the TPC monitoring information
is received through a radio resource control (RRC) message.
11. An apparatus for controlling uplink transmission power in a
wireless communication system, the apparatus comprising: a
transceiver configured to transmit and receive a radio signal; and
a processor connected to the transceiver and configured to:
instruct the transceiver to receive transmit power command (TPC)
monitoring information for receiving a plurality of TPCs to adjust
an uplink transmission power for a plurality of serving cell;
instruct the transceiver to receive a TPC payload by monitoring a
downlink control channel based on the TPC monitoring information;
instruct the transceiver to acquire a plurality of TPCs within the
TPC payload; and instruct the transceiver to apply the plurality of
TPCs to the uplink transmission power for each of the plurality of
serving cells.
12. The apparatus of claim 11, wherein the TPC monitoring
information comprises a TPC identifier masked with a cyclic
redundancy check (CRC) of the downlink control channel and
information on a plurality of TPC indexes indicating the plurality
of TPCs in the TPC payload.
13. The apparatus of claim 12, wherein the TPC monitoring
information comprises information on a size of the TPC payload.
14. The apparatus of claim 11, wherein the downlink control channel
is monitored in one cell of the plurality of serving cells.
15. The apparatus of claim 11, wherein the downlink control channel
is monitored in a common search space of one cell of the plurality
of serving cells.
Description
BACKGROUND OF THE INVENTION
Field of the invention
[0001] The present invention relates to wireless communication, and
more particularly, to a method for controlling uplink transmission
power in a wireless communication system and an apparatus using the
same.
Related Art
[0002] With the development of mobile technology, data traffic
usage is rapidly increasing. Standardization and technical
development in various fields are underway to quickly process a
great amount of data traffic using limited radio resources.
Representative technologies are 3D beamforming, massive
multiple-input multiple-output (MIMO), a heterogeneous network, and
a small cell.
[0003] A small cell is a technology for increasing traffic capacity
and data rate. Generally, a small cell is deployed as a hotspot in
macrocell coverage. A backhaul between a small cell and a macrocell
may be ideal or non-ideal. An ideal backhaul is assumed in
intra-site carrier aggregation (CA) or coordinated multi-point
(CoMP) technology. Dual connectivity is referred to as inter-site
CA, in which a non-ideal backhaul is assumed.
[0004] A method for controlling uplink transmission power with a
plurality of cells set is proposed.
SUMMARY OF THE INVENTION
[0005] The present invention provides a method for controlling
uplink transmission power in a wireless communication system and an
apparatus using the same.
[0006] In an aspect, a method for controlling uplink transmission
power in a wireless communication system is provided. The method
includes receiving, by a wireless device, transmit power command
(TPC) monitoring information for receiving a plurality of TPCs to
adjust an uplink transmission power for a plurality of serving
cell, receiving, by the wireless device, a TPC payload by
monitoring a downlink control channel based on the TPC monitoring
information, acquiring a plurality of TPCs within the TPC payload,
and applying the plurality of TPCs to the uplink transmission power
for each of the plurality of serving cells.
[0007] The TPC monitoring information may comprise a TPC identifier
masked with a cyclic redundancy check (CRC) of the downlink control
channel and information on a plurality of TPC indexes indicating
the plurality of TPCs within the TPC payload.
[0008] The TPC monitoring information may comprise information on a
size of the TPC payload.
[0009] In another aspect, an apparatus for controlling uplink
transmission power in a wireless communication system includes a
transceiver configured to transmit and receive a radio signal, and
a processor connected to the transceiver. The processor is
configured to instruct the transceiver to receive transmit power
command (TPC) monitoring information for receiving a plurality of
TPCs to adjust an uplink transmission power for a plurality of
serving cell, instruct the transceiver to receive a TPC payload by
monitoring a downlink control channel based on the TPC monitoring
information, instruct the transceiver to acquire a plurality of
TPCs within the TPC payload, and instruct the transceiver to apply
the plurality of TPCs to the uplink transmission power for each of
the plurality of serving cells.
[0010] When a plurality of uplink channels is transmitted from a
plurality of serving cells, it is possible to adjust uplink
transmission power for each uplink channel.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 shows uplink (UL) power control in existing 3GPP
LTE.
[0012] FIG. 2 shows an example of DCI format 3/3A in 3GPP LTE.
[0013] FIG. 3 shows various examples of scenarios of configuring a
plurality of cells.
[0014] FIG. 4 is a flowchart illustrating UL transmission power
control according to one embodiment of the present invention.
[0015] FIG. 5 shows UL transmission power control according to
another embodiment of the present invention.
[0016] FIG. 6 is a block diagram illustrating a wireless
communication system according to one embodiment of the present
invention.
DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0017] A wireless device may be fixed or mobile, and a user
equipment (UE) may be referred to as another term, such as a mobile
station (MS), a mobile terminal (MT), a user terminal (UT), a
subscriber station (SS), a personal digital assistant (PDA), a
wireless modem, a handheld device, and the like. Alternatively, the
wireless device may be a device supporting only data communication,
such as a machine-type communication (MTC) device.
[0018] Abase station (BS) generally refers to a fixed station that
communicates with a wireless device and may be referred to as
another term, such as an evolved NodeB (eNB), a base transceiver
system (BTS), an access point (AP), and the like.
[0019] In the following description, the present invention is
applied on the basis of 3rd Generation Partnership Project (3GPP)
Long Term Evolution (LTE) based on the 3GPP Technical
Specifications (TSs). However, this is merely an example, and the
present invention may be applied to various wireless communication
networks.
[0020] In 3GPP LTE, scheduling is performed per subframe. For
example, one subframe has a length of 1 ms, which is defined as a
transmission time interval (TTI). A radio frame includes 10
subframes, and one subframe may include two consecutive slots. A
subframe may include a plurality of orthogonal frequency division
multiplexing (OFDM) symbols. As 3GPP LTE uses orthogonal frequency
division multiple access (OFDMA) in a downlink (DL), an OFDM symbol
is provided merely to express one symbol period in a time domain,
and the present invention is not limited by a multiple access mode
or term. For example, an OFDM symbol may be referred to as another
term, such as a single carrier-frequency division multiple access
(SC-FDMA) symbol, a symbol interval, and the like. According to
3GPP LTE, one subframe includes 14 OFDM symbols in a normal cyclic
prefix (CP), and one subframe includes 12 OFDM symbols in an
extended CP.
[0021] Physical channels in 3GPP LTE may be divided into downlink
(DL) physical channels and uplink (UL) physical channels. The DL
physical channels include a physical downlink control channel
(PDCCH), a physical control format indicator channel (PCFICH), a
physical hybrid-ARQ indicator channel (PHICH), and a physical
downlink shared channel (PDSCH). The UL physical channels include a
physical uplink control channel (PUCCH) and a physical uplink
shared channel (PUSCH).
[0022] A PCFICH transmitted in the first OFDM symbol of a subframe
carries a control format indicator (CIF) on the number of OFDM
symbols used for transmission of control channels in the subframe
(i.e., the size of a control region). A wireless device first
receives the CIF on the PCFICH and then monitors a PDCCH.
[0023] A PHICH carries a positive-acknowledgement
(ACK)/negative-acknowledgement (NACK) signal for an uplink hybrid
automatic repeat request (HARD). The ACK/NACK signal for uplink
(UL) data on a PUSCH transmitted by the wireless device is sent on
the PHICH.
[0024] Control information transmitted through a PDCCH is referred
to as downlink control information (DCI). The DCI may include PDSCH
resource allocation (which is also referred to as a downlink (DL)
grant), PUSCH resource allocation (which is also referred to as an
uplink (UL) grant), a set of transmission power control commands
for individual UEs in a UE group, and/or activation of Voice over
Internet Protocol (VoIP).
[0025] Blind decoding is used for detecting a PDCCH. Blind decoding
is a scheme in which a wireless device demasks a cyclic redundancy
check (CRC) of a received PDCCH (which is referred to as a
candidate PDCCH) with a desired identifier and checks a CRC error
to identify whether the PDCCH is a control channel for the wireless
device. ABS determines a PDCCH format according to DCI to be sent
to a wireless device and adds a CRC to the DCI. Then, the BS masks
the CRC with a unique identifier (which is referred to as a radio
network temporary identifier (RNTI)) depending on the owner or
purpose of the PDCCH.
[0026] A PUCCH carries uplink control information (UCI) and
supports multiple formats. A PUCCH having a different number of
bits per subframe may be used depending on a modulation scheme
subordinate to a PUCCH format. PUCCH format 1 is used for
transmission of a scheduling request (SR); PUCCH format Ia/Ib is
used for transmission of a CQI; and PUCCH format 2a/2b is used for
simultaneous transmission of CQI and an ACK/NACK signal.
[0027] FIG. 1 shows UL power control in existing 3GPP LTE.
[0028] ABS transmits information on a transmit power command (TPC)
10 to a wireless device. The TPC 10 is information sent by the BS
to adjust UL transmission power and is received on a PDCCH. First,
the TPC 10 may be transmitted via DCI along with scheduling
information for DL transmission or UL transmission. Second, the TPC
10 may be transmitted via DCI sending UL transmission power (which
is referred to as DCI format 3/3A). A 1-bit TPC indicates DCI
format 3A, while a 2-bit TPC indicates DCI format 3.
[0029] The wireless device determines UL transmission power based
on the TPC 10 and transmits a UL channel 20 based on the UL
transmission power.
[0030] Referring to Section 5 in 3GPP TS 36.213 V10.12.0 (2014
March), transmission power PPUSCH(i) for PUSCH transmission in
subframe i is defined as below:
[ Equation 1 ] ##EQU00001## P PUSCH ( i ) = min { P CMAX ( i ) , 10
log 10 ( M PUSCH ( i ) ) + P O_PUSCH ( j ) + .alpha. ( j ) PL c +
.DELTA. TF ( i ) + f ( i ) } ##EQU00001.2##
[0031] where
[0032] P.sub.CMAX is a maximum transmission power configured for
subframe i,
[0033] M.sub.PUSCH(i) is a PUSCH resource allocation bandwidth for
subframe i,
[0034] P.sub.O.sub._.sub.PUSCH(j) is a parameter given from an
upper layer,
[0035] .alpha.(j) is a parameter given to an upper layer,
[0036] PLc is a DL path loss estimate calculated by a wireless
device,
[0037] .DELTA..sub.TF(i) is a wireless device-specific parameter,
and
[0038] f(i) is a specified value acquired from a TPC.
[0039] A transmission power P.sub.PUCCH(i) for PUCCH transmission
in subframe i is defined as below:
[ Equation 2 ] ##EQU00002## P PUCCH ( i ) = min { P CMAX ( i ) , P
0 _PUCCH + PL c + h ( n CQI , n HARQ , n SR ) + .DELTA. F_PUCCH ( F
) + .DELTA. TxD ( F ) + g ( i ) } ##EQU00002.2##
[0040] where
[0041] P.sub.CMAX is a maximum transmission power configured for
subframe i,
[0042] PLc is a DL path loss estimate calculated by a wireless
device,
[0043] P.sub.O.sub._.sub.PUCCH is a parameter given by a BS,
[0044] h(n.sub.CQI, n.sub.HARQ, n.sub.SR) is a value dependent to a
PUCCH format,
[0045] .DELTA..sub.F.sub._.sub.PUCCH(F) is a parameter given by an
upper layer,
[0046] .DELTA..sub.TxD(F) is a value set when a PUCCH is
transmitted through multiple antennas, and
[0047] g(i) is a specified value acquired from a TPC.
[0048] FIG. 2 shows an example of DCI format 3/3A in 3GPP LTE.
[0049] TPC(n) is an nth TPC value, and n is a TPC index. N TPC
values form a payload, and a CRC is added thereto. The CRC is
masked with a TPC-RNTI to identify DCI format 3/3A having a
TPC.
[0050] A wireless device demasks the TCP-RNTI to monitor a PDCCH
per subframe. When DCI is received a PDCCH without a CRC error, the
wireless device applies a TPC corresponding to a pre-assigned TPC
index to UL transmission power.
[0051] Hereinafter, a multi-cell environment is described.
[0052] In a carrier aggregation (CA) environment or dual
connectivity environment, a wireless device may be served by a
plurality of serving cells. Each serving cell may be defined by a
downlink (DL) component carrier (CC) or a pair of a DL CC and a UL
CC.
[0053] The serving cells may be divided into a primary cell and a
second army cell. A primary cell is a cell that operates at a
primary frequency, performs an initial connection establishment
process, starts a connection reestablishment process, or is
designated as a primary cell in a handover process. A secondary
cell operates at a secondary frequency, may be configured after a
radio resource control (RRC) connection is established, and may be
used to provide an additional radio resource. At least one primary
cell is always configured, and a secondary cell may be
added/modified/released by an upper-layer signaling (for example,
an RRC message). The primary cell may have a fixed cell index (CI).
For example, the lowest CI may be assigned to the primary cell.
Hereinafter, the primary cell has a CI of 0, and secondary cells
are sequentially assigned CIs from 1.
[0054] FIG. 3 shows various examples of scenarios of configuring a
plurality of cells.
[0055] A first BS 110 is a macro BS having large coverage, and
second and third BSs 120 and 130 are small BSs having relatively
small coverage. A cell managed by the macro BSs 110 is a macro
cell, and cells managed by the small cells 120 and 130 are small
cells. Each of the BSs 110, 120, and 130 may manage one or more
cells.
[0056] In scenario 1, the macro BS 110 and the small BSs 120 and
130 communicate with a wireless device 140 using the frequency
band. In scenario 2, the macro BS 110 and the small BSs 120 and 130
communicate with the wireless device 140 using different frequency
band. In scenario 2, the small BS 120 is located out of the
coverage of the macro BS 110 and communicates with the wireless
device 140 using a frequency band the same as or different from
that for the macro BS 110.
[0057] In a dual connectivity situation, a master cell group (MCG)
and a secondary cell group (SCG) may be configured for a wireless
device for which a plurality of cells is configured. The MCG is a
serving cell group having a primary cell (PCell) and zero or more
secondary cells (SCells). The MCG may be served by the macro BS
110, and the SCG may be served by one or more small BSs 120 and
130. The SCG is a secondary cell group having a primary secondary
cell (PSCell) and zero or more secondary cells. An MCG cell is a
cell belonging to the MCG, and an SCG cell is a cell belonging to
the SCG. The PSCell is a secondary cell to which the wireless
device performs random access and to which an uplink control
channel (for example, a PUCCH) is transmitted.
[0058] To prevent a concentration of PUCCH traffic in a specific
cell, a network may support PUCCH offloading in a CA situation
although not supporting dual connectivity. The network may divide a
plurality of serving cells configured for a wireless device into a
plurality of cell groups and may configure at least one cell in
each cell group to transmit a PUCCH.
[0059] Hereinafter, a cell group including a PCell is defined as a
first cell group, and a cell group including at least one secondary
cell is defined as a second cell group. A cell capable of PUCCH
transmission in the first cell group is defined as a first PUCCH
cell, and a cell capable of PUCCH transmission in the second cell
group is defined as a second PUCCH cell. The first PUCCH cell and
the second PUCCH cell may independently transmit a UL channel. The
first PUCCH cell may be the PCell. The second PUCCH cell may be a
PSCell or SCell. Hereinafter, the first PUCCH cell may be
designated by a PCell, and the second PUCCH cell may be designated
by a PPCell. The PCell may send a message to designate a PPCell
among cells in the second cell group.
[0060] As described above, PUCCH transmission in only one cell is
considered for existing UL transmission power. Thus, it is proposed
how to control UL transmission power for two PUCCHs when the two
PUCCHs are transmitted in the PCell and the PPCell.
[0061] Although the following description is made on controlling UL
transmission power for two PUCCHs transmitted in two cells, a
person skilled in the art may readily apply this description to
controlling UL transmission power for a plurality of PUCCHs
transmitted in a plurality of cells.
[0062] First, the PCell and the PPCell are given DCI format 3/3A
illustrated in FIG. 2, which may be used for control of PUCCH
transmission power for the cells. For example, suppose that the
PCell receives first DCI format 3 and the PPCell receives second
DCI format 3. First DCI format 3 may be monitored based on a first
TPC-RNTI, and second DCI format 3 may be monitored based on a
second TPC-RNTI. The wireless device may apply a TPC of first DCI
format 3 to transmission power for a first PUCCH transmitted in the
PCell and may apply a TPC of second DCI format 3 to transmission
power for a second PUCCH transmitted in the PPCell. In this manner,
the wireless device has an advantageous of utilizing the existing
DCI format 3/3A structure. However, the wireless device performs
separate blind decoding on the two DCI formats, thus increasing
additional monitoring loads.
[0063] FIG. 4 is a flowchart illustrating UL transmission power
control according to one embodiment of the present invention.
[0064] A wireless device receives TPC monitoring information
(S410). The TPC monitoring information is information used for the
wireless device to monitor a DL control channel having a TPC over a
plurality of cells. The TPC monitoring information may be received
through an RRC message, a medium access control (MAC) message, or
DCI.
[0065] The following table illustrates examples of elements
included in the TPC monitoring information. Illustrated terms are
provided only for illustrative purposes, and not all elements are
essential.
TABLE-US-00001 TABLE 1 Term Description MTPC-RNTI Identifier masked
with CRC of DCI including TPC over a plurality of cells First
TPC-index Index of TPC applied to PUCCH transmission in first PUCCH
cell Second TPC-index Index of TPC applied to PUCCH transmission in
second PUCCH cell TPC payload size Payload size of DCI and/or
information on total number of TPCs in DCI
[0066] The wireless device monitors a PDCCH based on the TPC
monitoring information to receive a TPC (S420). The PDCCH may be
monitored in a common search space of a corresponding subframe in a
PCell.
[0067] The TPC monitoring information may include information on
the type or location of a search space in which the PDCCH is to be
monitored. The TPC monitoring information may include information
on a cell in which the PDCCH is to be monitored.
[0068] The wireless device identifies a CRC of the PDCCH using an
MTPC-RNTI in the common search space. When no CRC error is
detected, the wireless device acquires a TPC payload from the
PDCCH. The wireless device may acquire a first TPC corresponding to
a first TPC-index and a second TPC corresponding to a second
TPC-index from the TPC payload. The first TPC and the second TPC
may have the same number of bits (1 bit or 2 bit). Alternatively,
the first TPC and the second TPC may have different numbers of
bits.
[0069] The wireless device applies the first TPC to transmission
power for a first PUCCH and applies the second TPC to transmission
power for a second PUCCH (S430). The transmission powers for the
respective PUCCHs may be calculated by Equation 2. The first PUCCH
may be transmitted in the PCell, and the second PUCCH may be
transmitted in a PPCell. The first PUCCH and the second PUCCH may
be transmitted in the same subframe or in different subframes.
[0070] ABS transmits TCP information to be applied to a PUCCH
transmitted in a plurality of PUCCH cells to each wireless device
on a PDCCH. The payload size of the TPC information may be defined
according to the payload size of existing DCI format 3/3A in order
to reduce the number of PDCCH blind detection times.
[0071] Meanwhile, a TPC-RNTI may be assigned per PUCCH cell. The BS
may set a separate TPC-RNTI and a separate TPC-index for each PUCCH
cell. The wireless device may receive a TPC over each different
cell on each different PDCCH.
[0072] Alternatively, a common TPC-index may be applied to two or
more PUCCH cells, and a separate TPC RNTI may be assigned per PUCCH
cell.
[0073] The same TPC-RNTI and the same TPC-index may be applied to
all PUCCH cells.
[0074] FIG. 5 shows UL transmission power control according to
another embodiment of the present invention, which is UL power
control using DL scheduling DCI.
[0075] DCI 510 received in a PCell includes information on DL
scheduling for a PDSCH 520 and a TPC. A wireless transmits an HARQ
ACK/NACK for the PDSCH 520 on a PUCCH 530 in a PPCell.
[0076] The DCI 510 may include a TPC over the PUCCH 530. When the
ACK/NACK feedback on the PDSCH 520 of the PCell is transmitted in
the PPCell, the TPC in the DCI 510 scheduling the PDSCH 520 is
applied to the PUCCH 530 for the ACK/NACK feedback.
[0077] The DIC 510 is transmitted not only in the PCell but may be
transmitted in an SCell in which a PDSCH or PDCCH is
transmitted.
[0078] Hereinafter, an initial power setting for setting up PUCCH
transmission power is described with reference to Equation 2.
[0079] In Equation 2, PO_PUCCH is an offset value given by a BS,
and g(i) is a value constantly adjusted by a TPC. In detail,
P.sub.0.sub._.sub.PUCCH includes
P.sub.0.sub._.sub.NOMINAL.sub._.sub.PUCCH as a value reflecting a
cell-common environment and P.sub.O.sub._.sub.UE.sub._.sub.PUCCH as
a value reflecting an environment of each wireless device. g(i) is
initialized to g(0)=0 when P.sub.0.sub._.sub.PUCCH is initially set
or reset. When a random access process is performed, the sum of
.DELTA.P.sub.rampup as a cumulative value adjusted in the random
access process and .delta..sub.msg2 given in a random access
response is initialized to
g(0)=.DELTA.P.sub.rampup+.delta..sub.msg2.
[0080] P.sub.0.sub._.sub.PUCCH to be applied to PUCCH transmission
power for each PUCCH cell may be configured as follows.
[0081] (1) Set P.sub.0.sub._.sub.PUCCH for each PUCCH cell through
RRC signaling
[0082] (2) Use the same P.sub.0.sub._.sub.PUCCH configured for the
PCell to another PUCCH cell
[0083] (3) Set an offset value per PUCCH cell for
P.sub.0.sub._.sub.PUCCH configured for the PCell through RRC
signaling
[0084] (4) Use the same P.sub.0.sub._.sub.NOMINAL.sub._.sub.PUCCH
configured for the PCell to another PUCCH cell and set
P.sub.O.sub._.sub.UE.sub._.sub.PUCCH per PUCCH cell through RRC
signaling, which is useful when there is similarity in coverage,
frequency, and positional environment between the PPCell and the
PCell but it is intended to differentiate the PUCCH transmission
performance of the wireless device between the PCell and the
PPCell.
[0085] (5) Use the same P.sub.O UE PUCCH configured for the PCell
to another PUCCH cell and set
P.sub.0.sub._.sub.NOMINAL.sub._.sub.PUCCH per PUCCH cell through
RRC signaling, which is useful when there is difference in
coverage, frequency, and positional environment between the PPCell
and the PCell but it is intended to manage the PUCCH transmission
performance of the wireless device at a similar level between the
PCell and the PPCell.
[0086] g(t) to be applied to PUCCH transmission power for each
PUCCH cell may be initialized as follows. When no random access
process is performed in a corresponding PUCCH cell, g(0) may be set
as follows.
[0087] (1) When new P0_PUCCH is set for the PUCCH cell or new
P.sub.0.sub._.sub.PUCCH is set for the PCell, set g(0)=0.
[0088] (2) Set g(0) to the sum of .DELTA.P.sub.rampup and
.delta..sub.msg2 adjusted in the last random access process
performed in the PCell. This may be applied when new
P.sub.0.sub._.sub.PUCCH is not set for the PUCCH cell or new
P.sub.0.sub._.sub.PUCCH is not set for the PCell.
[0089] (3) Set whether to apply (1) or (2) through RRC
signaling.
[0090] FIG. 6 is a block diagram illustrating a wireless
communication system according to one embodiment of the present
invention.
[0091] A wireless device 50 includes a processor 51, a memory 52
and a transceiver 53. The memory 52 is connected to the processor
51, and stores various instructions implemented by the processor
51. The transceiver 53 is connected to the processor 51, and
transmits and/or receives radio signals. The processor 51
implements proposed functions, processes and/or methods. In the
above embodiments, a UL control operation of the wireless device
may be implemented by the processor 51. When the above embodiments
are implemented by a software instruction, the instruction may be
stored in the memory 52 and may be executed by the processor 51 to
perform the above operation.
[0092] ABS 60 includes a processor 61, a memory 62 and a
transceiver 63. The BS 60 may operate in an unlicensed band. The
memory 62 is connected to the processor 61, and stores various
instructions implemented by the processor 61. The transceiver 63 is
connected to the processor 61, and transmits and/or receives radio
signals. The processor 61 implements proposed functions, processes
and/or methods. In the above embodiments, an operation of the BS
may be implemented by the processor 61.
[0093] The processor may include Application-Specific Integrated
Circuits (ASICs), other chipsets, logic circuits, and/or data
processors. The memory may include Read-Only Memory (ROM), Random
Access Memory (RAM), flash memory, memory cards, storage media
and/or other storage devices. The RF unit may include a baseband
circuit for processing a radio signal. When the above-described
embodiment is implemented in software, the above-described scheme
may be implemented using a module (process or function) which
performs the above function. The module may be stored in the memory
and executed by the processor. The memory may be disposed to the
processor internally or externally and connected to the processor
using a variety of well-known means.
[0094] In the above exemplary systems, although the methods have
been described on the basis of the flowcharts using a series of the
steps or blocks, the present invention is not limited to the
sequence of the steps, and some of the steps may be performed at
different sequences from the remaining steps or may be performed
simultaneously with the remaining steps. Furthermore, those skilled
in the art will understand that the steps shown in the flowcharts
are not exclusive and may include other steps or one or more steps
of the flowcharts may be deleted without affecting the scope of the
present invention.
* * * * *